Homework Help: physics

Posted by jen on Tuesday, March 22, 2011 at 3:11pm.

A backpack full of books weighing 43.0 N rests on a table in a physics laboratory classroom. A spring with a force constant of 150 N/m is attached to the backpack and pulled horizontally, as indicated in the figure. If the spring stretches by 2.30 cm, what is the coefficient of static friction between the backpack and the table?

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